A study reveals that the average amount withdrawn at automatic teller machines (ATMs) is $160 per withdrawal.
Question:
A study reveals that the average amount withdrawn at automatic teller machines (ATMs) is $160 per withdrawal. This figure was determined using a random sample of 91 withdrawals at ATMs. The sample standard deviation is calculated to be $10 per withdrawal. Assume the dollar values of the withdrawals are normally distributed. Using the sample information, find a 90% confidence interval for the population variance of the withdrawal amount at ATMs.
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n 91 s 10 s 2 100 90 CI ...View the full answer
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Business Analytics And Statistics
ISBN: 9780730363330
1st Edition
Authors: Ken Black, John Asafu Adjaye, Paul Burke, Nelson Perera, Carl Sherwood, Saleh A. Wasimi
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